TY - JOUR
T1 - The SDSS-IV extended Baryon Oscillation Spectroscopic Survey
T2 - Selecting emission line galaxies using the Fisher discriminant
AU - Raichoor, A.
AU - Comparat, J.
AU - Delubac, T.
AU - Kneib, J. P.
AU - Yèche, Ch
AU - Zou, H.
AU - Abdalla, F. B.
AU - Dawson, K.
AU - De La Macorra, A.
AU - Fan, X.
AU - Fan, Z.
AU - Jiang, Z.
AU - Jing, Y.
AU - Jouvel, S.
AU - Lang, D.
AU - Lesser, M.
AU - Li, C.
AU - Ma, J.
AU - Newman, J. A.
AU - Nie, J.
AU - Palanque-Delabrouille, N.
AU - Percival, W. J.
AU - Prada, F.
AU - Shen, S.
AU - Wang, J.
AU - Wu, Z.
AU - Zhang, T.
AU - Zhou, X.
AU - Zhou, Z.
N1 - Funding Information:
A.R. acknowledges funding from the P2IO LabEx (ANR-10-LABX-0038) in the framework “Investissements d’Avenir” (ANR-11-IDEX-0003-01) managed by the French National Research Agency (ANR). J.C. acknowledges financial support from MINECO (Spain) under project number AYA2012-31101. J.P.K. and T.D. acknowledge support from the ERC advanced grant LIDA. This study is based on data from SDSS-III (full text acknowledgement: http://www.sdss3.org/collaboration/boiler-plate.php ) and is done in the context of SDSS-IV (full text acknowledgement: http://www.sdss.org/collaboration/#OfficialSDSSAcknowledgment ). The SCUSS is funded by the Main Direction Program of Knowledge Innovation of Chinese Academy of Sciences (No. KJCX2-EW-T06). It is also an international cooperative project between National Astronomical Observatories, Chinese Academy of Sciences and Steward Observatory, University of Arizona, USA. Technical support and observational assistances of the Bok telescope are provided by Steward Observatory. The project is managed by the National Astronomical Observatory of China and Shanghai Astronomical Observatory. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, the Jet Propulsion Laboratory/California Institute of Technology, and NEOWISE, which is a project of the Jet Propulsion Laboratory/California Institute of Technology. WISE and NEOWISE are funded by the National Aeronautics and Space Administration. This work is based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/ DAPNIA, at the Canada–France–Hawaii Telescope (CFHT), which is operated by the National Research Council (NRC) of Canada, the Institut National des Sciences de l’Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This research used the facilities of the Canadian Astronomy Data Centre operated by the National Research Council of Canada with the support of the Canadian Space Agency. This research uses data from the VIMOS VLT Deep Survey, obtained from the VVDS database operated by Cesam, Laboratoire d’Astrophysique de Marseille, France. This paper uses data from the VIMOS Public Extragalactic Redshift Survey (VIPERS). VIPERS was performed with the ESO Very Large Telescope under the “Large Programme” 182.A- 0886. The participating institutions and funding agencies are listed at http://vipers.inaf.it . We thank the anonymous referee for his report, which helped us improve the clarity of the paper.
Publisher Copyright:
© ESO 2015.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - We present a new selection technique of producing spectroscopic target catalogues for massive spectroscopic surveys for cosmology. This work was conducted in the context of the extended Baryon Oscillation Spectroscopic Survey (eBOSS), which will use ∼200 000 emission line galaxies (ELGs) at 0.6 ≤ zspec ≤ 1.0 to obtain a precise baryon acoustic oscillation measurement. Our proposed selection technique is based on optical and near-infrared broad-band filter photometry. We used a training sample to define a quantity, the Fisher discriminant (linear combination of colours), which correlates best with the desired properties of the target: redshift and [Oii] flux. The proposed selections are simply done by applying a cut on magnitudes and this Fisher discriminant. We used public data and dedicated SDSS spectroscopy to quantify the redshift distribution and [Oii] flux of our ELG target selections. We demonstrate that two of our selections fulfil the initial eBOSS/ELG redshift requirements: for a target density of 180 deg-2, ∼70% of the selected objects have 0.6 ≤ zspec ≤ 1.0 and only ∼1% of those galaxies in the range 0.6 ≤ zspec ≤ 1.0 are expected to have a catastrophic zspec estimate. Additionally, the stacked spectra and stacked deep images for those two selections show characteristic features of star-forming galaxies. The proposed approach using the Fisher discriminant could, however, be used to efficiently select other galaxy populations, based on multi-band photometry, providing that spectroscopic information is available. This technique could thus be useful for other future massive spectroscopic surveys such as PFS, DESI, and 4MOST.
AB - We present a new selection technique of producing spectroscopic target catalogues for massive spectroscopic surveys for cosmology. This work was conducted in the context of the extended Baryon Oscillation Spectroscopic Survey (eBOSS), which will use ∼200 000 emission line galaxies (ELGs) at 0.6 ≤ zspec ≤ 1.0 to obtain a precise baryon acoustic oscillation measurement. Our proposed selection technique is based on optical and near-infrared broad-band filter photometry. We used a training sample to define a quantity, the Fisher discriminant (linear combination of colours), which correlates best with the desired properties of the target: redshift and [Oii] flux. The proposed selections are simply done by applying a cut on magnitudes and this Fisher discriminant. We used public data and dedicated SDSS spectroscopy to quantify the redshift distribution and [Oii] flux of our ELG target selections. We demonstrate that two of our selections fulfil the initial eBOSS/ELG redshift requirements: for a target density of 180 deg-2, ∼70% of the selected objects have 0.6 ≤ zspec ≤ 1.0 and only ∼1% of those galaxies in the range 0.6 ≤ zspec ≤ 1.0 are expected to have a catastrophic zspec estimate. Additionally, the stacked spectra and stacked deep images for those two selections show characteristic features of star-forming galaxies. The proposed approach using the Fisher discriminant could, however, be used to efficiently select other galaxy populations, based on multi-band photometry, providing that spectroscopic information is available. This technique could thus be useful for other future massive spectroscopic surveys such as PFS, DESI, and 4MOST.
KW - Galaxies: general
KW - Galaxies: star formation
KW - Galaxies: stellar content
KW - Methods: data analysis
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U2 - 10.1051/0004-6361/201526486
DO - 10.1051/0004-6361/201526486
M3 - Article
AN - SCOPUS:84951785882
VL - 585
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
SN - 0004-6361
M1 - A50
ER -